class_docstr: RNG provider that derives new RNGs from the key
code: def __call__(self, *keys) -> np.random.Generator:
      seed = seedbank.derive_seed(*keys, base=self.seed)
      return seedbank.numpy_rng(seed)
  
file_path: lkpy/lenskit/util/random.py
imports: import numpy
  import seedbank
label_desc: Use image node_id 2 for calling the DerivingRNG obj's underlying member method code with example usage: obj.__call__() and returns: seedbank